## E.255. Release 7.4.18

Release date: 2007-09-17

This release contains fixes from 7.4.17. For information about new features in the 7.4 major release, see Section E.273, “Release 7.4”.

### E.255.1. Migration to Version 7.4.18

A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.11, see Section E.262, “Release 7.4.11”.

### E.255.2. Changes

- Prevent index corruption when a transaction inserts rows and then aborts close to the end of a concurrent `VACUUM` on the same table (Tom)

- Make `CREATE DOMAIN ... DEFAULT NULL` work properly (Tom)

- Fix excessive logging of SSL error messages (Tom)

- Fix crash when `log_min_error_statement` logging runs out of memory (Tom)

- Prevent `CLUSTER` from failing due to attempting to process temporary tables of other sessions (Alvaro)

- Require non-superusers who use `/contrib/dblink` to use only password authentication, as a security measure (Joe)